pjfanning commented on issue #879:
URL: https://github.com/apache/poi/issues/879#issuecomment-3187439853

   The temp file deletes happen when you call 'close' on the class that manages 
the file. TempFilePackagePart class closes the temp file in its close. So it 
looks like XSSFWorkbook close method may not be closing the package parts 
associated with the workbook.
   
   One observation: can't you write a job that deletes temp files that were 
created more than 24 hours ago? Or some number of hours that represents a safe 
number where you know that the creation of the workbook can't take that long. 
Even 1 hour should be safe enough but a middle ground like 3 or 6 hours might 
be safer. We hope to fix the temp file delete issue eventually but this might 
do as a workaround.


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